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high availability query sso 3.0

Good Day,

I am writing to you for your guidance please on High Availability options for SSO.

We already have a server with X.509 certifactes on ABAP Based systems. Now we want to add high availability feature to it.

I found the blog below with some interesting options

https://help.sap.com/viewer/df185fd53bb645b1bd99284ee4e4a750/3.0/en-US/f66ff414c7804d068d6aab770be18fc8.html

But I have a few questions on how enrollment URL's work

1) The guide says install and run several secure login servers on different AS java servers. If the first secure login server is down, it goes to the next secure login server that is specified in the list. How would this work ? When we configured X.509 on ABAP systems, we signed ABAP's SNC with existing SSO server(primary) and now if this goes down and enrollment URL points to secondary SSO server, how will SSO work because ABAP SNC was signed by Primary SSO server which went down

2) What exactly needs configured on these additional secure login servers. It is not very clear from the help above. Please provide guidance

Regards

Kalyan

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